Role of crystalline and damping anisotropy to the angular dependences of spin rectification effect in single crystal CoFe film

Author / Creator

MMM 2020 (2020)

Conferences

MMM 2020 M3: Magnetization Dynamics and Damping IV: Spin current, spin-torque, Spin Transport, Vortices, Skyrmions and Domain Walls (2020)

Available as

Online

Summary

The electrical detection of ferromagnetic resonance through the spin rectification (SR) effect has inspired great interest to investigate the magnetization dynamics in the last two decades. Further...

The electrical detection of ferromagnetic resonance through the spin rectification (SR) effect has inspired great interest to investigate the magnetization dynamics in the last two decades. Furthermore, a comprehensive understanding of SR is essential to study the spin pumping and spin Hall effects. Recently, the single crystalline Co0.5Fe0.5 (001) alloy film has attracted attention due to the giant damping anisotropy and current-orientation effect of anisotropic magnetoresistance [Phys. Rev. Lett. 122, 117203 (2019)]. In this experimental work, we studied the SR dependence on the magnetization and current orientations in the single crystalline Co0.5Fe0.5 (001) alloy film. We present the experimental evidence that the magnetization-orientation dependence of the SR signal in Co0.5Fe0.5 strongly differs from those reported in the polycrystalline films. The strong anisotropy ratio of the damping constant up to 520% is determined, which can induce the strong anisotropy of the resonant susceptibility driven by the microwave field. By considering the current-orientation dependent anisotropic magnetoresistance and the anisotropic susceptibility in single crystalline Co0.5Fe0.5, we explain such unusual angular dependent SR signal by the SR theory. Our measurements show the amplitude of the SR signal could have 13 times difference for the devices along the <110> and <100> directions, which introduces the crystalline symmetry as a new approach to engineer the microwave characteristics in microwave spintronics.

Show More